Toy flying machine



Sept. 24,

H. E. SHAEFFER f TOY FLYING MACHINE Filed Feb. 19., 1945 2 Sheets-Sheet 1 l Sept. 24, 1946.

H. E. SHAEFFER TOY FLYING MACHINE Filed Feb. 19', 1945 2 Sheets-Sheet 2 Patented Sept. 24, Y1946 c `Y'IOYFLYING 'y p Harvey vE. Shaeffer, Chicagm'lll., assignor to Ar-` vey Corporation, Chicago, Ill., a corporation of Illinois Applicupn February 19,` 1945, serial No. 578,581

This invention relates to toy flying machines and is more particularly concerned with toyA flying machines of the type provided with a pair of coaxially mounted propellers of opposite pitch adapted to be drivenin opposite directions from a single source of power, and has for an object the provision of improved means for mounting and driving the propellers for rotational movement in opposite directions.

It is a further object of this invention to provide means adapted to be positioned between a pair of coaxially mounted propellers for driving one of said propellers in the reverse direction responsive to rotational movement of the other propeller.

This invention further contemplates the provision of a dual propeller construction which ls relatively simple and inexpensive to manufacture and which may be sold either as an assembled unit or as a kit of parts for assembly by the buyer. f Itis a further object of this invention to provide a dual propeller construction of this type which may readily be assembled and mounted for operation on various types of flying machines such as monoplanes, biplanes, helicopters, etc.

This invention embodies other novel features, details of construction and arrangement of parts which are hereinafter set forth in the specification and claim and illustrated in the accompanying drawings wherein:

Fig. 1 is a side elevational view partly in section showing an airplane embodying a dual propeller construction embodying features of this invention.

Fig. 2 is an enlarged fragmentary longitudinal sectional view showing the dual propeller assembly.

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2.

Fig. 4 is a side elevational view, partly in section, showing a modified form of this invention as applied to the fuselage of a helicopter.

Fig. 5 is a plan view of same.

Referring now to the drawings for a better understanding of this invention and more particularly to Figs. 1 to 3 therein, the improved dual propeller assembly is shown as applied tok an airplane fuselage 6 provided with a propeller mounting wall 1.

The dual propeller assemblyr comprises a pair of propellers 8 and 9 having blades of opposite pitch. An aperture ll is provided in the Wall 1 of the fuselage to snugly receive a Wheel mountlng. l2 which is secured against relative rotational i 10mm. (ortie-78.)

,inner end of the wheel mounting I 2.

2 movement therewith by means of a keyk I3. The rear propeller 9 is preferably journaled on the Wheel mounting l2, and a thrust bearing I4, such as a pair of disc-shaped washers, is interposed between said propeller 9 and the Wall member l. A longitudinally extending bore I6 is formed in ther Wheel mounting l2 to receive and serve as a bearing for a driving shaft l1. The forward blade 8 is secured to the forward end of the driving shaft Il and is engaged against relative rotational movement therewith by bending the shaft laterally and thence rearwardly at I8 for offset engagement with the axis of the propeller. An enlarged ange portion I9 is formed on the forward end of the Wheel mounting l2 to support y a plurality of wheels 2| having their axes radially disposed from the axis of the Wheel mounting. The wheels are preferably journaled on nails 22 which pass through 'axial openings formed in the wheels for engagement with the periphery of the enlarged flange portion I9.

The driving shaft Il is preferably rotated by means of ra resilient rubber band 23 having its one end connected to a hook portion 24 provided on the driving shaft Il and its other end connected to a hook 426 secured to the rear 'end of the fuselage 6.

Referring now more particularly to Figs. 4 and ,5, the improved dual propeller assembly is shown as applied to a helicopter fuselage 3|. In this form of the invention the upper surface of the fuselage is provided with a top plate 32 formed with a centrally disposed aperture to receive the The propellers 33 and 34 are mounted and. arranged in the manner heretofore describedl in connection with the arrangement'and mounting of the propellers 8 and 9. However, the blades thereof are in the form usually provided on helicopters, As the other parts forming this construction are similar to the parts heretofore described, similar numerals are applied to indicate similar parts.

, In theroperation of each of the forms of this invention, the outer propeller, 8 or 33, is rst rotated manually to apply a twisting force to the resilient band 23.. When the outer propeller is released, the resilient band 23 acts through driving shafts l1 to rotate the forward propeller which, in turn, acts through the wheels 2| to drive the rear propeller in a reverse direction.

In the manufacture of an assembled propeller unit, or a kit of parts adapted for sale for assembly by the buyer, 'it will be observed that the propellers, wheels, and wheel mounting 'may be inexpensively formed of wood or other materials and that the several parts are adapted to be assembled and mounted upon either an airplane fuselage or a helicopter fuselage. In the sale of a kit of parts embodying the several parts of the propeller assembly, it is contemplated that each propeller may be formed in several parts for assembly by the buyer, and that each propeller may comprise a pair of blades having their inner ends glued or otherwise secured to a hub plate.

While this invention has been shown in but one form, it is obvious to those skilled in the art that it is not so limited but is susceptible of various changes and modifications Without departing from the spirit and scope of -the claimed invention.

I claim as my invention: Y A l In a toy ying machine, a fuselage, an idler Wheel mounting secured to said fuselage, a plu-` 4 rality of friction idler Wheels journaled upon and having their axes radially disposed about the axis of said idler Wheel mounting, a driving shaft journaled in said idler Wheel mounting, a front propeller secured on the outer end of said driving shaft for driving engagement with said friction idler wheels, a rear propeller. journaled on said idler wheel mounting to be driven in a reverse direction by said friction idler Wheels, and a resilient band having its one end secured to the inner endy of said driving shaft and its other end secured to said fuselage, said resilient band servingA toA rotate thefdriving shaft and to draw the latter rearwardly to maintain the front and rear propellers in operative frictional driving engagement against diametrically opposed sides of said friction idler wheels.

HARVEY E. SHAEFFER. 

